The method for trenchless replacement of pipelines

 

The invention relates to construction and is used when replacing underground pipelines. The new pipeline as its installation tighten into place before deleting the old pipe through a flexible corrugated heat insulating sleeve. At the same time serves hot air between the insulating sleeve and a new pipeline for heating it to a temperature not higher than the temperature of the beginning of the plastic deformation of the material of the new pipeline. If there around the old pipe frozen ground previously in the old pipeline serves the heated air until complete thawing of the soil. Increases the efficiency of the construction works. 1 Il.

The invention relates to the construction of production and can be used for trenchless replacement of underground pipelines for various purposes.

The known method of trenchless installation or replacement of the pipeline [1], including the formation of the working and auxiliary pits, the formation between the wells, the tightening in her pipeline. With this formation wells are puncture or by removing the replaced pipeline step-by-step cont the tool pulling head.

Known which is the technical entity closest to the proposed technical solution method for trenchless replacement of pipelines [2], including the formation of the mounting hole, the removal of the old pipe, utrambovyvaya its fragments in the soil and the delay through the previously traversed mounting hole mounted on the surface of the entire length of the new pipeline.

The disadvantages of the above methods is the inability to trenchless replacement of pipelines in adverse weather conditions (precipitation and low outdoor temperature) and the presence of permafrost in the area of the pipeline, as in this case, a high probability of getting poorly welded connection of new pipe and it is impossible to pressing the wreckage of the destroyed old pipes in frozen ground because of its nsimemory.

Object of the invention is the provision of opportunities for high-quality work on trenchless replacement of pipelines at low outside temperatures, precipitation and frozen ground in the area of the pipeline.

The problem is solved in that in the method for trenchless replacement of pipelines, including refraining from the gadfly, according to the invention the new pipeline as its installation tighten in place of the old fixed pipeline through a flexible corrugated heat insulating sleeve with a simultaneous flow between the insulating sleeve and a new pipeline of hot air to heat a new pipeline to a temperature not higher than the temperature of the beginning of the plastic deformation of its material, moreover, the presence around the old pipe frozen ground, in the old pipeline before its elimination served hot air until complete thawing of the soil.

The advantage of the proposed method is that the heating of the hot air of a new polymeric tubing, and the protection insulating sleeve provides flexibility of the new pipeline and the possibility of its submission to the old pipe from the surface at low outside temperatures. The flow of heated air into the old pipeline, in the presence around him frozen ground, carries out its defrosting and the possibility of pressing the wreckage of the destroyed old pipeline in the thawed soil. The use of corrugated sleeve provides its flexibility and thermal insulation ability due slimming is proposed in the invention, the flow of hot air in the flexible hose between it and the new pipeline makes possible the continuity of his warm-up without interruption for a period of welding, eliminates repeated attachment and detachment of the heat source increases the flexibility of the new pipeline in case of incomplete heating of the thickness of its walls.

The drawing shows a flow chart of the method for trenchless replacement of pipelines.

Installation for the implementation of the proposed method, replacing the old pipe 1 on the new pipeline 2 includes a working body 3 (air puncher), power device consisting of a winch 4, a cable 5 and the compressor 6, the device for butt connection of new pipe (welding machine), consisting of bilateral heating element 7 for contact heating ends mounted the new pipeline 2 and the guide clip 8 for connection of pipe ends after melting. The plant is equipped with passed through the casing 9 of the mounting hole 10 of the flexible corrugated insulating sleeve 11, one end of which is in observation wells 12, and the other through the flange 13 with a hole attached to the shelter 14 and through the flexible tube 15 to the heat source 16. Moreover, the ends of the sleeves 11 of the elastic ring 17 is sealed and slidable pressed for a new pipeline 2. The front end of the working body 3 is connected by a cable 5 with the winch 4, Lisala of the proposed method is as follows.

With the ground surface prior to meeting with an observation well 12 by means of the working body 3 to form an inclined mounting hole 10 (in the presence of loose soil or sand into the mounting hole 10 simultaneously with the sinking of delaying the same work body 3 metal casing tube 9). Then on the surface of the ground set of the shelter 14. Through the mounting hole 10 is passed a flexible corrugated heat insulating sleeve 11, with one end connecting flange 13 with shelter 14 and the flexible pipe 15 with the heat source 16, and the other is placed in observation wells 12. If there around the old pipe 1 frozen ground free end of the sleeve 11 attached to the old pipe 1 and serves it hot air until complete thawing of the soil. After that, the sleeve 11 is cut off from the old pipe 1. The process of installation of the new pipeline 2 is carried out in the shelter 14. The ends of the links of the new pipeline 2 is installed in the guide clip 8 between bilateral heating element 7 and incubated for the specified time before melting. Then the heating element 7 is removed and the ends of the links of the new pipeline 2 press using the guide clip 8 to the formation of strong welded seasonale link. By the end, passing through the sleeve 11, the new pipeline 2 attach the working body 3 and enter it into the old pipe 1. The delay of the new pipeline 2 is carried out with the help of the working body 3 and winch 4 cable 5, spread through the old pipe 1. This operation periodically alternates with the operation of welding the new pipeline 2. The process of replacing the old pipe 1 is performed step by step. Moving inside the old pipe 1, the working body 3 destroys it, utrambovyvaya debris in the soil, and at the same time tighten in the formed hole new pipeline 2 larger outer diameter than the old one.

The proposed method of replacing pipelines industrially applicable and allows you to perform high-quality replacement pipelines year-round regardless of weather and climatic conditions.

Sources of information

1. RF patent №2135874, CL 7 F 16 L 1/028, 1998.

2. RF patent №2105919, CL 7 F 16 L 1/028, 1998.

Claims

The method for trenchless replacement of pipelines, including removing the old pipe and the delay through the previously traversed the mounting hole of the new pipeline, characterized in that the new pipeline as it is m UCAV with simultaneous flow between the insulating sleeve and a new pipeline of hot air to heat a new pipeline to a temperature not higher than the temperature of the beginning of the plastic deformation of the material, moreover, the presence around the old pipe frozen ground in the old pipeline before its elimination served hot air until complete thawing of the soil.

 

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